RETURNS TABLE function returns nothingness

Good evening,

please help me to figure out, why doesn't this simple test function return
a row with 42, NULL values:

CREATE OR REPLACE FUNCTION words_merge_users_2(
IN in_users jsonb,
IN in_ip inet
) RETURNS TABLE (
out_uid integer,
out_banned varchar
) AS
$func$
DECLARE
_user jsonb;
_uids integer[];
_created timestamptz;
_vip timestamptz;
_grand timestamptz;
_banned_until timestamptz;
_banned_reason varchar;
BEGIN
out_uid := 42;
END
$func$ LANGUAGE plpgsql;

Here I call it at PostgreSQL 9.5.4 prompt in MacOS:

# select * from
words_merge_users_2('[{"given":"Abcde","social":1,"auth":"07f0254f5e55413dec7f32c8ef4ee5d3","stamp":1470237061,"female":0,"sid":"11111"}]
'::jsonb, '1.1.1.1'::inet);
out_uid | out_banned
---------+------------
(0 rows)

Thank you (I am probably missing something very obvious)
Alex